Saw over Distrowatch that a free promo edition of Turbolinux 8 Server is available for download:

"A promo edition of Turbolinux 8 Server can now be had for free, after registration. The registration page is in Japanese only, but it's a simple matter to fill in your name (middle row) and email address (bottom row) and agreeing to the license by clicking on the long button on the bottom left. The next page will give you a login name and password to access the ISO image."